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<div class="layui-container" style='font: 12px/14px arial,helvetica,sans-serif;'>
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		<span class="layui-breadcrumb" lay-separator="/">
      <a href="/" style="font: 12px/14px arial,helvetica,sans-serif;">{:lang('Home')}</a>
      {foreach $crumbs as $k=>$v }
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        <div class="layui-card-header">
            <h1>{:lang('Super-Precision Contact Ball Bearings Designs And Variants')}</h1>
        </div>

        <!-- content -->
        <div class="Bearings-content">
            <div class="Bearings-specs">
                    <div style="margin-top: -30px; height: 50px;line-height: 20px;">
                        {:lang('Single row super-precision angular contact ball bearings are non-separable and, like all angular contact ball bearings, have raceways in the inner and outer rings that are displaced relative to each other in the direction of the bearing axis. This means that in addition to radial loads, these bearings can also accommodate axial loads in one direction. Radial loads induce axial forces in these bearings that need to be balanced by counterforces. An angular contact ball bearing is, therefore, always adjusted against a second bearing or used in sets.')}
                    </div>
                <br>
                <div class="card">
                    <div role="tab" class="card-header" id="panel-1-header">
                        <div style="margin-top: -20px;color: #0073a5;font-size: 1.5rem;font-weight: 500; ">{:lang('Bearing series')}</div><span _ngcontent-ume-c124="" class="open"><i _ngcontent-ume-c124="" class="icon-plus"></i></span></div><div role="tabpanel" id="panel-1" aria-labelledby="panel-1-header" class="collapse"><div class="card-body"><rich-text-field _ngcontent-ume-c124="" _nghost-ume-c88=""><div _ngcontent-ume-c88="" class="content text-darker-green-grey"><div _ngcontent-ume-c88="" id="rich-text-div">
                    <hr>
                    <p>{:lang('The assortment of super-precision angular contact ball bearings includes bearings in the following dimension series:')}</p>
                    <ul class="qq">
                        <li>&emsp;{:lang('Ultra light 718 series')}</li>
                        <li>&emsp;{:lang('Extremely light 719 series')}</li>
                        <li>&emsp;{:lang('Light 70 series')}</li>
                        <li>&emsp;{:lang('Robust 72 series')}</li>
                    </ul>
                    <p>{:lang('The cross sections of the four bearing series are compared in  for the same bore and same outside diameters. Each bearing series has characteristic features that make it particularly suitable for certain bearing applications.')}</p>
                    <br>
                    <p>{:lang('Where a low cross-sectional height is a critical design parameter, bearings in the 718 series should be selected. If more radial space is available, and loads are not very heavy, bearings in the 719 or 70 series could be used. Bearings in the 72 series have the largest cross-sectional height for a given bore diameter and are suitable for heavy loads at relatively low speeds.')}</p>
                    <br>
                    <p>{:lang('If a high degree of stiffness is required, bearings in the 718 and 719 series are typically used. Bearings in these two series contain the largest number of balls, relative to the selected bore size, and can also accommodate the largest shaft diameter, relative to their outside diameter. Both characteristics are particularly important for system rigidity, as the rigidity of a spindle increases with its shaft diameter, and the rigidity of a bearing arrangement increases with the number of balls.')}</p></div><!----></div><!----><!----></rich-text-field><!----><!----><!----></div></div><!----></div>
                <br>

                <div class="card"><div role="tab" class="card-header" id="panel-2-header">
                    <div style="color: #0073a5;margin-top: -50px;font-size: 1.5rem;font-weight: 500;">{:lang('Contact angles')}</div><span _ngcontent-ume-c124="" class="open"><i _ngcontent-ume-c124="" class="icon-plus"></i></span></div><div role="tabpanel" id="panel-2" aria-labelledby="panel-2-header" class="collapse"><div class="card-body"><rich-text-field _ngcontent-ume-c124="" _nghost-ume-c88=""><div _ngcontent-ume-c88="" class="content text-darker-green-grey"><div _ngcontent-ume-c88="" id="rich-text-div">
                    <hr>
                    <div>{:lang('Super-precision angular contact ball bearings are manufactured with the following contact angles')} :</div>
                    <br>
                    <ul class="qq">
                        <li>&emsp;A 15° {:lang('contact angle, designation suffix')} C</li>
                        <li>&emsp;A 25° {:lang('contact angle, designation suffix')} AC</li>
                    </ul>
                    <br>
                    <div>{:lang('For S70 W series bearings, the contact angle is 18° (designation suffix F). For other series, bearings with an 18° contact angle (designation suffix F), are available on request.')}</div>
                    <br>
                    <div>{:lang('A larger contact angle provides a higher degree of axial stiffness and a higher axial load carrying capacity. However, speed capability, radial stiffness, and radial load carrying capacity are reduced.')}</div></div><!----></div><!----><!----></rich-text-field><!----><!----><!----></div></div><!----></div>


                <div class="card"><div role="tab" class="card-header" id="panel-3-header">
                    <div style="color: #0073a5; margin-top: -15px;font-size: 1.5rem;font-weight: 500;">{:lang('Designs')}</div><span _ngcontent-ume-c124="" class="open"><i _ngcontent-ume-c124="" class="icon-plus"></i></span></div><div role="tabpanel" id="panel-3" aria-labelledby="panel-3-header" class="collapse"><div class="card-body"><rich-text-field _ngcontent-ume-c124="" _nghost-ume-c88=""><div _ngcontent-ume-c88="" class="content text-darker-green-grey"><div _ngcontent-ume-c88="" id="rich-text-div">
                    <hr>
                    <div style="color: #0073a5;font-size:16px;">{:lang('High-capacity D design bearings')}</div>
                    <br>
                    <div>{:lang('D design bearings  are designed to accommodate heavy loads at relatively high speeds under low to moderate operating temperatures. When compared to other precision angular contact ball bearings, D design bearings contain the maximum number and size of balls. Their close osculation provides a relatively high degree of stiffness and the highest possible load carrying capacity.')}</div>
                    <br>
                    <div>{:lang('Typical applications for bearings in the 718 .. D series include')}:</div>
                    <br>
                    <ul class="qq">
                        <li>&emsp;{:lang('Machine tools, e.g. multispindle drilling heads')} </li>
                        <li>&emsp;{:lang('Robotics')}</li>
                        <li>&emsp;{:lang('Printing')}</li>
                        <li>&emsp;{:lang('Measuring systems')}</li>
                        <li>&emsp;{:lang('Racing car wheels')}</li>
                    </ul>
                    <br>
                    <div>{:lang('Typical applications for bearings in the 719 .. D and 70 .. D series include')}:</div>
                    <br>
                    <ul class="qq">
                        <li>&emsp;{:lang('Machining centres (horizontal and vertical)')} </li>
                        <li>&emsp;{:lang('Milling machines')}</li>
                        <li>&emsp;{:lang('Lathes')} </li>
                        <li>&emsp;{:lang('External and surface grinding machines')}</li>
                        <li>&emsp;{:lang('Boring machines')}</li>
                        <li>&emsp;{:lang('Machines for cutting or polishing stones and glass')}</li>
                        <li>&emsp;{:lang('Semiconductor industry, e.g. units for detecting defects on silicon wafer chips')} </li>
                        <li>&emsp;{:lang('Boat gyrostabilizers')}</li>
                        <li>&emsp;{:lang('Telescopes')}</li>
                        <li>&emsp;{:lang('Microturbines')}</li>
                        <li>&emsp;{:lang('Racing/super car wheels')}</li>
                        <li>&emsp;{:lang('Medical equipment')}</li>
                    </ul>
                    <br>
                    <div>{:lang('Typical applications for bearings in the 72 .. D series include')}:</div>
                    <br>
                    <ul class="qq">
                        <li>&emsp;{:lang('Machine tool spindles e.g. live centre spindles')} </li>
                        <li>&emsp;{:lang('Lathes (main spindles, tailstock)')}</li>
                        <li>&emsp;{:lang('Grinding machines')}</li>
                        <li>&emsp;{:lang('Boring machines')}</li>
                        <li>&emsp;{:lang('Parallel Kinematic Machines (PKM)')}</li>
                        <li>&emsp;{:lang('Dynamometers for engine testing')}</li>
                        <li>&emsp;{:lang('High-speed turbochargers')}</li>
                    </ul>
                    <br>
                    <div style="color: #0073a5;font-size: 16px;">{:lang('High-speed E design bearings')}</div>
                    <br>
                    <div>{:lang('E design bearings when compared to D design bearings, have a more open osculation and a maximum number of smaller balls. They can therefore accommodate very high speeds but do not have the same high load carrying capacity as D design bearings. Compared to B design bearings, E design bearings have a slightly higher speed capability and can accommodate heavier loads.')}</div>
                    <br>
                    <div>{:lang('Typical applications for bearings in the 719 .. E and 70 .. E series include')}:</div>
                    <br>
                    <ul class="qq">
                        <li>&emsp;{:lang('Electro-spindles')}</li>
                        <li>&emsp;{:lang('High-speed machining centres (horizontal and vertical)')} </li>
                        <li>&emsp;{:lang('High-speed milling machines')}</li>
                        <li>&emsp;{:lang('High-speed internal grinding machines')}</li>
                        <li>&emsp;{:lang('High-speed spindles for PCB drilling')}</li>
                        <li>&emsp;{:lang('Woodworking machines')}</li>
                    </ul>
                    <br>
                    <div style="color: #0073a5;font-size:16px;">{:lang('High-speed W design bearings')}</div>
                    <br>
                    <div >{:lang('W design bearings when compared to D design bearings, have a more open osculation and a maximum number of smaller balls. They can therefore accommodate very high speeds but do not have the same high load carrying capacity as D design bearings.')}</div>
                    <br>
                    <div >{:lang('W design bearings are only available as hybrid (balls made of bearing grade silicon nitride), sealed and lubricated for life, angular contact ball bearings with an 18° contact angle. Their new cage design has a very high stability at low and medium speeds for reduced noise and vibration levels. They are available as single bearings for universal matching or as matched sets of two bearings arranged back-to-back or in tandem.')}</div>
                    <br>
                    <div>{:lang('Typical applications for bearings in the S70 .. W series include medium-high volume production machines such as')}:</div>
                    <br>
                    <ul class="qq">
                        <li>&emsp;{:lang('Woodworking machines')} </li>
                        <li>&emsp;{:lang('Transfer machines')}</li>
                        <li>&emsp;{:lang('Small machining centres')}</li>
                        <li>&emsp;{:lang('Tool grinding machines')}</li>
                    </ul>

                    <br>
                    <div style="color: #0073a5;font-size:16px;">{:lang('High-speed B design bearings')}</div>
                    <br>
                    <div> {:lang('B design bearings are designed for high-speed operation and are best suited for lighter loads and lower operating temperatures. When compared to E and D design bearings, B design bearings are equipped with the maximum number of very small balls. The smaller, lighter balls reduce the centrifugal loads acting on the outer ring raceway and therefore reduce the stresses on the rolling contact surfaces. As smaller balls require less space, the bearing rings have a larger cross-sectional height, making them less susceptible to distortion resulting from irregularities of the bearing seat, either on the shaft or in the housing.')}</div>
                    <br>
                    <div >{:lang('Typical applications for bearings in the 719 .. B and 70 .. B series include')}:</div>
                    <br>
                    <ul class="qq" style="margin-top: -10px;">
                        <li>&emsp;{:lang('Electro-spindles')}</li>
                        <li>&emsp;{:lang('Metal cutting machines')}</li>
                        <li>&emsp;{:lang('Woodworking machines')}</li>
                        <li>&emsp;{:lang('Milling machines')}</li>
                        <li>&emsp;{:lang('Machining centres')}</li>
                    </ul>


                    <br>




                <div class="card"><div role="tab" class="card-header" id="panel-6-header">
                    <div style="color:#0073a5;font-size: 1.5rem;font-weight: 500;margin-top: -10px;">{:lang('Sealing solutions')}</div><span _ngcontent-ume-c124="" class="open"><i _ngcontent-ume-c124="" class="icon-plus"></i></span><!----><!----></button><!----></div><div role="tabpanel" id="panel-6" aria-labelledby="panel-6-header" class="collapse"><div class="card-body"><rich-text-field _ngcontent-ume-c124="" _nghost-ume-c88=""><div _ngcontent-ume-c88="" class="content text-darker-green-grey"><div _ngcontent-ume-c88="" id="rich-text-div">
                    <hr>
                    <div >{:lang('The most common bearings can be supplied with an integral seal fitted on both sides (designation prefix S). The seal forms an extremely narrow gap with the inner ring shoulder and therefore speed capability is not compromised.')}</div>
                    <br>
                    <div >{:lang('The seals are made standard of an oil- and wear-resistant NBR and are reinforced with sheet steel. On request, bearings can be supplied with seals made of FKM.')}</div>
                    <br>
                    <div >{:lang('Sealed bearings are filled as standard with a high-quality, low-viscosity grease that has a lithium soap thickener and a synthetic ester base oil. The quantity of grease fills ~ 15% of the free space in the bearing. The temperature range for the grease is –55 to +110 °C <em>(–65 to +230 °F)</em>. On request, the bearings can be supplied with other greases. For additional information, contact the application engineering service.')}</div>
                    <br>
                    <div>{:lang('When compared to bearing arrangements with open bearings and external seals, sealed bearings can provide a number of advantages, including')}:</div>
                    <br>
                    <ul class="qq">
                        <li>&emsp;{:lang('Potential for extended bearing service life')}</li>
                        <li>&emsp;{:lang('Extended maintenance intervals')}</li>
                        <li>&emsp;{:lang('Reduced inventory')}</li>
                        <li>&emsp;{:lang('Reduced risk of lubricant contamination during mounting and operation')}</li>
                    </ul>
                    <br>
                    <div>{:lang('Sealed bearings are lubricated for life. They should not be washed or heated to temperatures above 80 °C <em>(175 °F)</em>. If a sealed bearing is to be heated for mounting, an induction heater must be used and the bearing should be fitted immediately to minimize the time that the bearing is exposed to high temperatures.')}</div>
                    <br>
                    <div class="warning-text" style="height: 150px;width: 600px;background-color: #FCDEDF;">
                        <br><br>
                        <div style="color: #EB202A;margin-left: 50px;font-size: 1.5rem">{:lang('WARNING')}</div>
                        <br>
                        <div style="margin-left: 50px;">{:lang('Seals made of FKM (fluoro rubber) exposed to an open flame or temperatures above 300&nbsp;°C <em>(570&nbsp;°F)</em> are a health and environmental hazard! They remain dangerous even after they have cooled.')}</div>
                        <br>
                        <div style="margin-left: 50px;">{:lang('Read and follow the safety precautions under this')} <strong>{:lang('WARNING')}</strong>.</div>
                    </div></div><!----></div><!----><!----></rich-text-field><!----><!----><!----></div></div><!----></div>

                    <br>

                <div class="card"><div role="tab" class="card-header" id="panel-7-header">
                    <div style="color:#0073a5;font-size: 1.5rem;font-weight: 500;margin-top: -10px;">{:lang('Direct oil-air lubrication')}</div><span _ngcontent-ume-c124="" class="open"><i _ngcontent-ume-c124="" class="icon-plus"></i></span><!----><!----></button><!----></div><div role="tabpanel" id="panel-7" aria-labelledby="panel-7-header" class="collapse"><div class="card-body"><rich-text-field _ngcontent-ume-c124="" _nghost-ume-c88=""><div _ngcontent-ume-c88="" class="content text-darker-green-grey"><div _ngcontent-ume-c88="" id="rich-text-div">
                    <hr>
                    <div >{:lang('Some very high speed applications require open bearings in the 719&nbsp;..&nbsp;D and 70&nbsp;..&nbsp;D series, 719&nbsp;..&nbsp;E and 70&nbsp;..&nbsp;E series, and 719&nbsp;..&nbsp;B and 70&nbsp;..&nbsp;B series to be lubricated with minimal amounts of oil, directly through their outer rings.')}</div>
                    <br>
                    <div>{:lang('On request, bearings can be supplied with two lubrication holes in their outer rings. Bearings with an annular groove or an annular groove and two annular O-ring grooves, complete with O-rings to seal to the bearing housing bore, are also available The positions of these features are listed in the product table')}</div></div><!----></div><!----><!----></rich-text-field><!----><!----><!----></div></div><!----></div>




<!--                <div class="card"><div role="tab" class="card-header" id="panel-10-header">-->
<!--                    <div style="color:#458DE1;">Bearing arrangement design</div><span _ngcontent-ume-c124="" class="open"><i _ngcontent-ume-c124="" class="icon-plus"></i></span>&lt;!&ndash;&ndash;&gt;&lt;!&ndash;&ndash;&gt;</button>&lt;!&ndash;&ndash;&gt;</div><div role="tabpanel" id="panel-10" aria-labelledby="panel-10-header" class="collapse"><div class="card-body"><rich-text-field _ngcontent-ume-c124="" _nghost-ume-c88=""><div _ngcontent-ume-c88="" class="content text-darker-green-grey"><div _ngcontent-ume-c88="" id="rich-text-div">-->
<!--                    <hr>-->
<!--                    <div style="margin-top: 10px;">Bearing arrangements using super-precision angular contact ball bearings can be specified as single bearings or as bearing sets.</div>-->
<!--                    <div style="margin-top: 10px;">An example of what options are available when ordering bearings for a three-bearing arrangement is provided in <a class="modal-window" title="Example of the ordering possibilities for a three-bearing arrangement" href="tcm:307-129282">table&nbsp;1</a>.</div>-->
<!--                    <br>-->
<!--                    <div style="color: #0073a5;font-size: 1.5em;margin-top: 10px;">Single bearings</div>-->
<!--                    <br>-->
<!--                    <div style="height: 50px;line-height: 30px;">Single, super-precision angular contact ball bearings are available as standalone bearings or as universally matchable bearings. When ordering single bearings, indicate the number of individual bearings required. Standalone bearings are intended for arrangements where only one bearing is used in each bearing position. Although the widths of the bearing rings are made to very tight tolerances, these bearings are not suitable for mounting immediately adjacent to each other.</div>-->
<!--                    <br>-->
<!--                    <div style="height: 50px;line-height: 30px;margin-top: 30px;">Universally matchable bearings are specifically manufactured so that when mounted in random order, but immediately adjacent to each other, preload within a predetermined range and effective load sharing will result without the use of shims or similar devices.</div>-->
<!--                    <br>-->
<!--                    <div style="">Single, universally matchable bearings are available in different preload classes and are identified by the designation suffix G.</div>-->
<!--                    <br>-->

<!--                    <div style="color: #0073a5;font-size: 1.5em;">Bearing sets</div>-->
<!--                    <br>-->
<!--                    <div style="height: 50px;line-height: 30px;">Sets of super-precision angular contact ball bearings are available as matched bearing sets or as sets of universally matchable bearings. When ordering bearing sets, indicate the number of bearing sets required (the number of individual bearings per set is specified in the designation).</div>-->
<!--                    <br>-->
<!--                    <div style="height: 50px;line-height: 30px;">Bearings can be supplied as a complete bearing set consisting of two, three or more bearings. The bearings are matched to each other during production so that when mounted immediately adjacent to each other, in the specified order, preload within a predetermined range and effective load sharing will result without the use of shims or similar devices.</div>-->
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<!--                    <div>The bore and outside diameters of these bearings are matched to within a maximum of one-third of the permitted diameter tolerance, to provide better load distribution than single universally matchable bearings.</div>-->
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<!--                    <div>Matched bearing sets are available in different preload classes.</div>-->
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<!--                    <div>Sets of universally matchable bearings:</div>-->
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<!--                        <li>&emsp;Can be mounted in random order for any desired bearing arrangement. The bore and outside diameters of a set of universally matchable bearings are matched to within a maximum of one-third of the permitted diameter tolerance, resulting in better load sharing, when mounted, than single universally matchable bearings.</li>-->
<!--                        <li>&emsp;Are available in different preload classes</li>-->
<!--                        <li>&emsp;Like single, universally matchable bearings, are identified by the designation suffix G, but the position of the letter G in the designation is different</li>-->
<!--                        <li>&emsp;Are not available in the S70 .. W series.</li>-->

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<!--                    <div style="color: #0073a5;font-size: 1.5em;">Bearing arrangements</div>-->
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<!--                    <div style="color: #0073a5;font-size: 1.5em;">Back-to-back arrangement</div>-->
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<!--                    <div>In a back-to-back bearing arrangement the load lines diverge along the bearing axis. Axial loads acting in both directions can be accommodated, but only by one bearing or bearing set in each direction.</div>-->
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<!--                    <div>Bearings mounted back-to-back provide a relatively rigid bearing arrangement. The wide span between bearing effective centres makes this arrangement particularly well suited to support moment loads.</div>-->
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<!--                    <div style="color: #0073a5;font-size: 1.5em;">Face-to-face arrangement</div>-->
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<!--                    <div>In a face-to-face bearing arrangement the load lines converge along the bearing axis. Axial loads acting in both directions can be accommodated, but only by one bearing or bearing set in each direction.</div>-->
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<!--                    <div>The short span between effective bearing centres makes face-to-face arrangements less suitable to support moment loads.</div>-->
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<!--                    <div style="color: #0073a5;font-size: 1.5em;">Tandem arrangement</div>-->
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<!--                    <div>The use of a tandem arrangement provides increased axial and radial load carrying capacity compared to a single bearing. In a tandem arrangement the load lines are parallel so that radial and axial loads are shared.</div>-->
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<!--                    <div>The bearing set can only accommodate axial loads acting in one direction. If axial loads act in both directions, or if combined loads are present, additional bearing(s) adjusted against the tandem arrangement must be-->
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